Heney s



v (No Model.)

' S. DICKINSON.

. CHIMNEY GAB. 'No. 299,628. Patented June 3, 1884.

WITNESSES 'INVENTOR wa w v WMWM UNITED STATES PATENT Orrfcn.

HENRY S. DICKINSON, OF JERSEY CITY, NEXV JERSEY.

CHIMNEY-CAP.

SPECIFICATION forming part of Letters Patent No. 299,628, dated June 3,1884.

. Application filed January 28, 1884. (N0 model.)

.part of this specification, and to the letters and figures of referencethereon.

The invention relates to chimney-caps, and has for its object theprevention of back-drafts in chimneys, particularly such as are due tothe rush of air downward upon a chimney, which is common in citieswherelow buildings stand adjacent to high buildings. It has been commonto run the chimneys and chimney-ex tensions of the low houses up in suchcases to the top of the adjacent higher building, and various deviceshave been used to maintain the draft in lower chimneys steady andcontinuous without this extension of the chimney. The present inventionis an improved device intended tomaintain a steady draft under all.circumstances and it consists of the 1111- proved chimney-caphereinafter described and claimed.

The accompanying drawings represent my improved device.

Figures 1 and 2 are sectional views on the lines 1 1 and 2 2.

Like letters of reference indicate like parts.

A is the flue, that is fastened to the chimneytop in any suitable way,so as to form a continuation of the flue of the chimney. It issurmounted by the cylindrical cap B, which is pierced by the transversecylindrical tube 0. The tube 0 is open at both ends-to wit, at a theother end. This tube 0 is cut through 5 along its roof or upper part,thereby forming the opening d, through which communication is had withthe interior of the cap B. This opening (1 is equal or greater incapacitythan the capacity of the chimney-flue. It is the only openingfrom the interior of the cap B. The products of combustion pass upthrough the flue, around the tube 0 within the interior of the cap B,down through the opening d, into the tube 0, and out through theopenings a orb, or both. When the wind drives up or down or otherwisedirectly past the openings a and b, it causes a suction out of both ofthose openings, whereby the draft of the chimney is maintained. When thewind drives into either of the openings a or I), it

passes directly through the tube 0 and out at the opposite opening,causing a suction down through the opening (1, whereby the draft ismaintained.

I do not claim herein the-device shown in patent to J. L. Willson, No.150,211, dated April 28, 1874. My arrangement avoids the back-draftsthat would be caused in the device of Willson by the interference of oneflue-discharge with the other.

I claim As a new article of manufacture, a chimneycap consisting of thecap B, having a transverse tube, G, provided with openings a, b, and d,substantially as and for the purposes set forth.

HENRY s. mcKINsoN.

W'itnesses:

JOHN J. PHELAN, ALAN D. KENYoN.

